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Magnetic powder surface gradient coating structure, coating method and soft magnetic composite material

A coating structure, surface gradient technology, applied in the direction of inorganic material magnetism, metal material coating process, transportation and packaging, etc., can solve the problems of low resistivity, thermal expansion coefficient mismatch, etc., to achieve good high-frequency characteristics, thermal expansion coefficient Controllable and reduce the effect of eddy current loss

Active Publication Date: 2021-09-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of low material resistivity and mismatch of thermal expansion coefficients between cladding layers in the prior art

Method used

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  • Magnetic powder surface gradient coating structure, coating method and soft magnetic composite material
  • Magnetic powder surface gradient coating structure, coating method and soft magnetic composite material
  • Magnetic powder surface gradient coating structure, coating method and soft magnetic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Gradient structure SiO on the surface of Fe powder 2 -(MnZn)Fe 2 o 4 Preparation of cladding layer cladding and soft magnetic composite materials:

[0051] Take 30g of ferromagnetic powder and wash it twice with alcohol. Mix the cleaned iron powder with a small amount of deionized water and absolute ethanol, add KH550, TEOS, and MnCl to the mixture 2 4H 2 O, ZnCl 2 and FeCl 3 ·6H 2 O, the added Mn 2 + :Zn 2+ :Fe 3+ The molar ratio is 1:1:4. Dilute to 200 mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 95%:5%. In the reaction system, the mass percent of ferromagnetic powder, surface modifier, silicon source precursor, and soluble metal salt is: 1:0.02:0.2:0.05. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 10.5, and...

Embodiment 2

[0054] Gradient structure coating on the surface of Fe powder and Fe / SiO 2 -ZrO 2 Preparation of soft magnetic composite materials:

[0055] Take 30g of iron powder and wash it twice with alcohol. Mix the cleaned ferromagnetic powder with a small amount of deionized water and absolute ethanol, and add KH560, TEOS, zirconium isopropoxide (C 12 h 28 o 4 Zr). Dilute to 200mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 90%:10%. In the reaction system, iron powder, KH560, TEOS, C 12 h 28 o 4 The mass percentage of Zr is: 1:0.02:0.2:0.05. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 10, and mechanically stir for 0.5h. Continue to add an appropriate amount of citric acid H 3 C 6 h 5 o 7 , adjust the pH value of the solution t...

Embodiment 3

[0058] Gradient structure coating on the surface of FeSiCr magnetic powder and FeSiCr / SiO 2 -Al 2 o 3 Preparation of soft magnetic composite materials:

[0059] Take 30g of FeSiCr powder and wash it twice with alcohol. Mix the cleaned powder with a small amount of deionized water and absolute ethanol, and add KH570, TEOS, zirconium isopropoxide (C 12 h 28 o 4 Zr). Dilute to 200 mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 95%:5%. In the reaction system, iron powder, KH560, TEOS, C 12 h 28 o 4 The mass percentage of Zr is: 1:0.04:0.5:0.005. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 11, and mechanically stir for 0.5h. Continue to add an appropriate amount of citric acid H 3 C 6 h 5 o 7 , adjust the pH value of the ...

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Abstract

A magnetic powder surface gradient coating structure, coating method and soft magnetic composite material, the gradient coating structure is composed of a coating layer formed on the surface of ferromagnetic powder by silicon dioxide and other coating components, the coating layer The contents of silica and other coating components are distributed in a gradient. The coating method is to deposit silicon dioxide and other coating groups on the surface of the ferromagnetic powder in one step by chemical co-precipitation, and adjust the pH value of the system during the deposition process. The soft magnetic composite material is obtained by compressing ferromagnetic powder with a coating layer on the surface and performing segmental annealing. The thermal expansion coefficient of the cladding layer prepared by the present invention is controllable, and the prepared soft magnetic composite material has low eddy current loss, high magnetic permeability, high resistivity, and high saturation magnetization, which overcomes the low resistivity and low cladding layer of the prior art materials. It provides a good method to solve the problems of the existing magnetic powder cores, such as the decrease of high-frequency magnetic permeability, large eddy current loss, and serious heat generation.

Description

technical field [0001] The invention discloses a magnetic powder surface gradient coating structure, a coating method and a soft magnetic composite material. In particular, it refers to a gradient coating structure containing multiple oxides on the surface of the magnetic powder, a coating method of the gradient coating structure and a soft magnetic composite material prepared by using the gradient coating structure magnetic powder. The invention belongs to the technical field of soft magnetic composite material preparation. Background technique [0002] Soft Magnetic Composites (Soft Magnetic Composites, SMCs), also known as metal magnetic powder core materials, is a new type of composite material prepared by coating the surface of ferromagnetic powder particles with an insulating medium. Effective frequency of use for magnetic materials. The volume resistivity of the soft magnetic composite material is increased by insulating coating on the surface of the soft magnetic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C18/12H01F1/33H01F41/00
CPCC23C18/1208H01F1/33H01F41/00B22F2207/01B22F1/16
Inventor 李丽娅高智陈秋丽葛毅成
Owner CENT SOUTH UNIV
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